CVE-2023-46841 Affecting xen-tools-xendomains-wait-disk package, versions <4.17.3_08-150500.3.27.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.04% (11th percentile)

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  • Snyk IDSNYK-SLES155-XENTOOLSXENDOMAINSWAITDISK-6592418
  • published9 Apr 2024
  • disclosed3 Apr 2024

Introduced: 3 Apr 2024

CVE-2023-46841  (opens in a new tab)

How to fix?

Upgrade SLES:15.5 xen-tools-xendomains-wait-disk to version 4.17.3_08-150500.3.27.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xen-tools-xendomains-wait-disk package and not the xen-tools-xendomains-wait-disk package as distributed by SLES. See How to fix? for SLES:15.5 relevant fixed versions and status.

Recent x86 CPUs offer functionality named Control-flow Enforcement Technology (CET). A sub-feature of this are Shadow Stacks (CET-SS). CET-SS is a hardware feature designed to protect against Return Oriented Programming attacks. When enabled, traditional stacks holding both data and return addresses are accompanied by so called "shadow stacks", holding little more than return addresses. Shadow stacks aren't writable by normal instructions, and upon function returns their contents are used to check for possible manipulation of a return address coming from the traditional stack.

In particular certain memory accesses need intercepting by Xen. In various cases the necessary emulation involves kind of replaying of the instruction. Such replaying typically involves filling and then invoking of a stub. Such a replayed instruction may raise an exceptions, which is expected and dealt with accordingly.

Unfortunately the interaction of both of the above wasn't right: Recovery involves removal of a call frame from the (traditional) stack. The counterpart of this operation for the shadow stack was missing.

CVSS Scores

version 3.1